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    • Rangeland Ecology & Management, Volume 63 (2010)
    • Rangeland Ecology & Management, Volume 63, Number 2 (March 2010)
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    Precipitation Regulates the Response of Net Ecosystem CO2 Exchange to Environmental Variation on United States Rangelands

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    Author
    Polley, H. Wayne
    Emmerich, William
    Bradford, James A.
    Sims, Phillip L.
    Johnson, Douglas, A.
    Saliendra, Nicanor Z.
    Svejcar, Tony
    Angell, Raymond
    Frank, Albert B.
    Phillips, Rebecca L.
    Snyder, Keirith A.
    Morgan, Jack A.
    Sanabria, Joaquin
    Mielnick, Patricia C.
    Dugas, William
    Show allShow less
    Issue Date
    2010-03-01
    Keywords
    climatic variability
    deserts
    functional change
    grasslands
    shrublands
    variability in carbon flux
    
    Metadata
    Show full item record
    Citation
    Polley, H. W., Emmerich, W., Bradford, J. A., Sims, P. L., Johnson, D. A., Saliendra, N. Z., ... & Snyder, K. A. (2010). Precipitation regulates the response of net ecosystem CO2 exchange to environmental variation on United States rangelands. Rangeland Ecology & Management, 63(2), 176-186.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/642776
    DOI
    10.2111/REM-D-09-00015.1
    Additional Links
    https://rangelands.org/
    Abstract
    Rangelands occupy 50% of Earth’s land surface and thus are important in the terrestrial carbon (C) cycle. For rangelands and other terrestrial ecosystems, the balance between photosynthetic uptake of carbon dioxide (CO2) and CO2 loss to respiration varies among years in response to interannual variation in the environment. Variability in CO2 exchange results from interannual differences in 1) environmental variables at a given point in the annual cycle (direct effects of the environment) and in 2) the response of fluxes to a given change in the environment because of interannual changes in biological factors that regulate photosynthesis and respiration (functional change). Functional change is calculated as the contribution of among-year differences in slopes of flux-environment relationships to the total variance in fluxes explained by the environment. Functional change complicates environmental-based predictions of CO2 exchange, yet its causes and contribution to flux variability remain poorly defined. We determine contributions of functional change and direct effects of the environment to interannual variation in net ecosystem exchange of CO2 (NEE) of eight rangeland ecosystems in the western United States (58 site-years of data). We predicted that 1) functional change is correlated with interannual change in precipitation on each rangeland and 2) the contribution of functional change to variance in NEE increases among rangelands as mean precipitation increases. Functional change explained 10-40% of the variance in NEE and accounted for more than twice the variance in fluxes of direct effects of environmental variability for six of the eight ecosystems. Functional change was associated with interannual variation in precipitation on most rangelands but, contrary to prediction, contributed proportionally more to variance in NEE on arid than more mesic ecosystems. Results indicate that we must account for the influence of precipitation on flux-environment relationships if we are to distinguish environmental from management effects on rangeland C balance. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/REM-D-09-00015.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 63, Number 2 (March 2010)

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